CN107800665B

CN107800665B - Multimedia transmission method, access network equipment and terminal

Info

Publication number: CN107800665B
Application number: CN201610799568.3A
Authority: CN
Inventors: 刘菁; 戴明增; 严乐
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2016-08-31
Filing date: 2016-08-31
Publication date: 2020-08-25
Anticipated expiration: 2036-08-31
Also published as: CN107800665A; WO2018040988A1

Abstract

The embodiment of the invention discloses a multimedia transmission method, access network equipment and a terminal, wherein the method comprises the following steps: the method comprises the steps that access network equipment obtains MPD file information corresponding to a target multimedia segment, wherein the target multimedia segment is a multimedia segment requested to be downloaded by a terminal; the access network equipment acquires a first code rate, wherein the first code rate is a code rate adopted by the terminal for downloading the target multimedia fragment; the access network equipment determines a second code rate according to the first code rate, the network state and the MPD file information, wherein the MPD file information comprises the first code rate and the second code rate; and the access network equipment sends first information to the terminal, wherein the first information is used for the terminal to download the target multimedia segment corresponding to the second code rate according to the first information. By adopting the invention, the access network equipment adjusts the code rate of multimedia transmission according to the network state, ensures that the selected code rate is appropriate, and improves the user experience.

Description

Multimedia transmission method, access network equipment and terminal

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a multimedia transmission method, an access network device, and a terminal.

Background

Dynamic Adaptive Streaming over HTTP (DASH) based on Hypertext Transfer Protocol (HTTP) is a Protocol proposed by The third Generation Partnership project (3 GPP) to enable Streaming media to be played smoothly when bandwidth fluctuation is large. Fig. 1 is an architecture diagram of a DASH system, as shown in fig. 1, the DASH system includes: a DASH client and a DASH server, wherein the DASH server comprises: a DASH content preparation module, a DASH Media Presentation Description (MPD) file distribution function module, and a DASH Media Segment (Segment) distribution function module.

The DASH system works by segmenting multimedia (e.g., video, audio, etc.) information into many small multimedia segments, which are stored on a DASH server, and each multimedia segment is made into block samples of different bit rates to cover different bandwidth conditions. The DASH client acquires and analyzes an MPD file corresponding to the multimedia information, acquires, from the MPD file, a description related to each multimedia segment, including a Uniform Resource Locator (URL) address, a play start time and duration, a resolution of a video, a code rate, and the like of each multimedia segment, and acquires and plays the multimedia information according to the MPD file. The existing DASH protocol supports adaptive bitrate switching, that is, a same source media stream can generate a plurality of video segments with different bitrate, when a source media stream is input, a content preparation module of a DASH server encodes the content of the source media stream at different quality levels according to the specified bitrate of a source media stream provider, usually in units of Megabits Per Second (Mbps), for example, 20Mbps, 50Mbps, and 100Mbps, according to the specified bitrate of the source media stream provider, generates media files with different bitrate, and cuts and segments the media files with different bitrate to generate Segment files of streaming media segments, and generates corresponding MPD files at the same time, wherein the MPD files provide detailed description information of segments for a client, including bitrate, resolution, URL address, Segment time length, and the like, so that the MPD files can provide access addresses of the video segments with different bitrate at the same time.

Specifically, referring to fig. 2 for a flow of a multimedia transmission method in the conventional art, as shown in fig. 2, before playing a video, a DASH client first sends an MPD file request message (i.e. HTTP request for MPD in fig. 2) to a DASH server, so as to request to acquire an MPD file corresponding to the video. After receiving the MPD file request message, the DASH server's MPD file distribution function module sends an MPD file (i.e., MPSresponse in fig. 2) to the DASH client, and the DASH client acquires the MPD file to obtain an access address (i.e., URL) of each video Segment (i.e., Segment file) in the video, and then sends a video Segment download request message (i.e., HTTP request for Media Segment in fig. 2) to the DASH server corresponding to the access address, where the video Segment download request message includes a bitrate selected by the DASH client, so as to obtain a Segment file that meets the bitrate, and after receiving the video Segment download request message, the DASH server's Segment distribution function module sends a Segment file (i.e., Media Segment response in fig. 2) corresponding to the bitrate selected by the DASH client to the DASH client.

In the conventional technology, the selection of the adaptive bitrate is completely controlled and executed by the DASH client, and the DASH client adaptively selects the video segments corresponding to different bitrates for downloading according to parameters such as the network bandwidth of the DASH client and the data volume of the buffer area.

Disclosure of Invention

The embodiment of the invention provides a multimedia transmission method, access network equipment and a terminal, wherein the access network equipment adjusts the code rate of multimedia transmission according to the network state, can ensure that the selected code rate is appropriate, and improves the user experience.

In a first aspect, a multimedia transmission method is provided. The method comprises the following steps: the access network equipment acquires MPD file information corresponding to a target multimedia segment, wherein the target multimedia segment is a multimedia segment requested to be downloaded by a terminal. The access network equipment acquires a first code rate, wherein the first code rate is a code rate adopted by the terminal for downloading the target multimedia fragment. And the access network equipment determines a second code rate according to the first code rate, the network state and the MPD file information. The MPD file information comprises a first code rate and a second code rate. And the access network equipment sends first information to the terminal, wherein the first information is used for the terminal to download the target multimedia fragment corresponding to the second code rate according to the first information.

By executing the steps, the access network equipment adjusts the code rate adopted by the terminal for downloading the target multimedia fragment according to the network state, so that the terminal downloads the target multimedia fragment corresponding to the adjusted second code rate, the selected code rate can be ensured to be appropriate, and better user experience can be ensured.

With reference to the first aspect, in a first implementation manner of the first aspect, MPD file information corresponding to a target multimedia segment acquired by an access network device is described. The access network equipment acquires MPD file information corresponding to the target multimedia segment according to the MPD file information corresponding to the target multimedia segment from the terminal, wherein the MPD file information is acquired by the terminal from the server.

By executing the steps, the access network equipment can directly acquire the MPD file information corresponding to the target multimedia segment from the terminal, and the processing efficiency of the access network equipment is improved.

With reference to the first aspect, in a second implementation manner of the first aspect, MPD file information corresponding to a target multimedia segment obtained by an access network device is described. The access network equipment acquires the MPD file information corresponding to the target multimedia segment from the MPD file response message, wherein the MPD file response message is the response of the server to the MPD file request message sent by the terminal, and the MPD file request message is used for requesting to acquire the MPD file information corresponding to the target multimedia segment.

By executing the steps, the access network device may monitor an MPD file request message sent by the terminal to the server, and monitor an MPD file response message sent by the server to the terminal according to the MPD file request message, thereby acquiring MPD file information from the MPD file response message. The access network equipment intercepts and captures the MPD file information sent to the terminal by the server, and the terminal does not need to send the MPD file information to the access network equipment, so that the complexity and the system overhead of the terminal are reduced.

With reference to the second implementation manner of the first aspect, in a third implementation manner of the first aspect, before the access network device receives an MPD file request message sent by a terminal, the access network device receives first indication information sent by the terminal. The obtaining, by the access network device, MPD file information corresponding to the target multimedia segment from the MPD file response message specifically includes: and the access network equipment acquires MPD file information corresponding to the target multimedia segment from the MPD file response message according to the first indication information from the terminal, wherein the first indication information is used for indicating the access network equipment to acquire the MPD file information sent by the server.

By executing the above steps, because the MPD file response message belongs to an application layer message, according to a normal processing flow, the access network device only transparently transmits the message without analyzing specific contents therein, whereas in the present invention, the access network device needs to analyze the MPD file response message and acquire MPD file information therefrom, and the access network device can monitor the MPD file information sent to the terminal by the server according to the first indication information sent by the terminal and acquire the MPD file information from the MPD file response message, instead of analyzing all messages sent by the server, thereby reducing the system overhead of the access network device.

With reference to the first aspect, or the first implementation manner of the first aspect, or the second implementation manner of the first aspect, or the third implementation manner of the first aspect, in a fourth implementation manner of the first aspect, the obtaining of the first code rate by the access network device is described. And the access network equipment acquires the first code rate from the MPD file information according to the first media identifier from the terminal. Here, the first media identifier is used to indicate a first code rate at which the terminal downloads the target multimedia segment.

With reference to the fourth implementation manner of the first aspect, in a fifth implementation manner of the first aspect, the first Media identifier may be sent to the Access network device through a first Radio Resource Control (RRC) message or a first Media Access Control (MAC) layer message.

With reference to the first aspect, or the first implementation manner of the first aspect, or the second implementation manner of the first aspect, or the third implementation manner of the first aspect, or the fourth implementation manner of the first aspect, or the fifth implementation manner of the first aspect, in a sixth implementation manner of the first aspect, the description is performed on the sending, by the access network device, of the first information to the terminal. And the access network equipment sends a second media identifier to the terminal, wherein the second media identifier is used for indicating the terminal to acquire a second code rate from the MPD file information according to the second media identifier and downloading a target multimedia segment corresponding to the second code rate from the server.

With reference to the sixth implementation manner of the first aspect, in a seventh implementation manner of the first aspect, the second media identifier may be sent to the terminal through a second RRC message or a second MAC message.

With reference to the first aspect, or the first implementation manner of the first aspect, or the second implementation manner of the first aspect, or the third implementation manner of the first aspect, in an eighth implementation manner of the first aspect, the obtaining, by the access network device, the first code rate is described. The access network equipment acquires the first code rate from a multimedia fragment downloading request message sent to the server by the terminal. The multimedia fragment downloading request comprises a first code rate and an identifier of a target multimedia fragment, and the multimedia fragment downloading request is used for requesting to download the target multimedia fragment corresponding to the first code rate.

By executing the steps, the access network equipment directly acquires the first code rate from the multimedia fragment downloading request message sent by the terminal by monitoring the multimedia fragment downloading request message sent by the terminal, and the method is simple and convenient.

With reference to the first aspect, or the first implementation manner of the first aspect, or the second implementation manner of the first aspect, or the third implementation manner of the first aspect, or the eighth implementation manner of the first aspect, in a ninth implementation manner of the first aspect, the sending, by the access network device, the first information to the terminal is described. And the access network equipment sends the target multimedia segment corresponding to the second code rate to the terminal, wherein the target multimedia segment corresponding to the second code rate is downloaded from the server by the access network equipment.

With reference to the third implementation manner of the first aspect, in a tenth implementation manner of the first aspect, the first indication information may be sent to the access network device through a third RRC message or a third MAC message.

In a second aspect, a method of multimedia transmission is provided. The method comprises the following steps: the terminal sends a first message to the access network equipment, wherein the first message is used for the access network equipment to acquire MPD file information corresponding to a target multimedia segment, and the target multimedia segment is a multimedia segment requested to be downloaded by the terminal. And the terminal sends a second message to the access network equipment. The second message is used for the access network equipment to acquire the first code rate and determine the second code rate according to the first code rate, the network state and the MPD file information, wherein the first code rate is a code rate adopted by the terminal to download the target multimedia segment, and the MPD file information comprises the first code rate and the second code rate. And the terminal receives first information sent by the access network equipment, wherein the first information is used for the terminal to download the target multimedia fragment corresponding to the second code rate according to the first information.

With reference to the second aspect, in a first implementation manner of the second aspect, the first message includes MPD file information corresponding to the target multimedia segment.

By executing the steps, the terminal can directly send the MPD file corresponding to the target multimedia segment to the access network equipment, and the processing efficiency of the access network equipment is improved.

With reference to the second aspect, in a second implementation manner of the second aspect, the first message is an MPD file request message, and the MPD file request message is used to request to acquire MPD file information corresponding to a target multimedia segment.

By executing the steps, the terminal can send an MPD file request message to the access network device, and the access network device can monitor the MPD file request message sent by the terminal to the server, and monitor an MPD file response message sent by the server to the terminal according to the MPD file request message, so as to obtain MPD file information from the MPD file response message. The access network equipment intercepts and captures the MPD file information sent to the terminal by the server, and the terminal does not need to send the MPD file information to the access network equipment, so that the complexity and the system overhead of the terminal are reduced.

With reference to the second implementation manner of the second aspect, in a third implementation manner of the second aspect, before the terminal sends the first message to the access network device, the terminal also sends first indication information to the access network device, where the first indication information is used to indicate the access network device to acquire MPD file information sent by the server.

By executing the above steps, because the MPD file response message belongs to an application layer message, according to a normal processing flow, the access network device only transparently transmits the message without analyzing specific contents therein, whereas in the present invention, the access network device needs to analyze the MPD file response message and acquire MPD file information therefrom, the terminal can send first indication information to the access network device, the access network device can monitor the MPD file information sent to the terminal by the server according to the first indication information and acquire the MPD file information from the MPD file response message, instead of analyzing all messages sent by the server, so that the system overhead of the access network device is reduced.

With reference to the second aspect, or the first implementation manner of the second aspect, or the second implementation manner of the second aspect, or the third implementation manner of the second aspect, in a fourth implementation manner of the second aspect, the second message includes a first media identifier, and the first media identifier is used to instruct the access network device to acquire the first bitrate from the MPD file information according to the first media identifier.

With reference to the fourth implementation manner of the second aspect, in a fifth implementation manner of the second aspect, the terminal may send the first media identifier to the access network device through a first RRC message or a first MAC message.

With reference to the second aspect, or the first implementation manner of the second aspect, or the second implementation manner of the second aspect, or the third implementation manner of the second aspect, or the fourth implementation manner of the second aspect, or the fifth implementation manner of the second aspect, in a sixth implementation manner of the second aspect, the receiving, by the terminal, the first information sent by the access network device, and downloading, according to the first information, the target multimedia fragment corresponding to the second code rate is described. And the terminal receives a second media identifier sent by the access network equipment, wherein the second media identifier is used for acquiring a second code rate corresponding to the second media identifier from the MPD file information and downloading a target multimedia segment corresponding to the second code rate from the server.

With reference to the sixth implementation manner of the second aspect, in a seventh implementation manner of the second aspect, the second media identifier may be sent to the terminal through a second RRC message or a second MAC message.

With reference to the second aspect, or the first implementation manner of the second aspect, or the second implementation manner of the second aspect, or the third implementation manner of the second aspect, in an eighth implementation manner of the second aspect, the second message is a multimedia clip downloading request message sent by the terminal to the server, the multimedia clip downloading request message includes a first bitrate and an identifier of the target multimedia clip, and the multimedia clip downloading request is used for requesting to download the target multimedia clip corresponding to the first bitrate.

By executing the steps, the terminal sends a multimedia segment downloading request message to the access network equipment, and the access network equipment directly obtains the first code rate from the multimedia segment downloading request message sent by the terminal by monitoring the multimedia segment downloading request message, so that the method is simple and convenient.

With reference to the second aspect, or the first implementation manner of the second aspect, or the second implementation manner of the second aspect, or the third implementation manner of the second aspect, or the eighth implementation manner of the second aspect, in a ninth implementation manner of the second aspect, the description is performed on the terminal receiving the first information sent by the access network device, and downloading the target multimedia segment corresponding to the second code rate according to the first information. And the terminal receives the target multimedia segment corresponding to the second code rate sent by the access network equipment. And the target multimedia segment corresponding to the second code rate is downloaded from the server by the access network equipment.

With reference to the second implementation manner of the second aspect, in a tenth implementation manner of the second aspect, the first indication information may be sent to the access network device through a third RRC message or a third MAC message.

In a third aspect, an access network device is provided, which includes a processor and a transceiver, where the processor is configured to perform the following operations: the processor acquires MPD file information corresponding to a target multimedia segment, wherein the target multimedia segment is a multimedia segment requested to be downloaded by the terminal. The processor obtains a first code rate, wherein the first code rate is a code rate adopted by the terminal for downloading the target multimedia segment. And the processor determines a second code rate according to the first code rate, the network state and the MPD file information. The MPD file information comprises a first code rate and a second code rate. And the transceiver sends first information to the terminal, and the first information is used for the terminal to download the target multimedia segment corresponding to the second code rate according to the first information.

By executing the above operation, the access network device adjusts the code rate used by the terminal to download the target multimedia segment according to the network state, so that the terminal downloads the target multimedia segment corresponding to the adjusted second code rate, the selected code rate can be ensured to be appropriate, and better user experience can be ensured.

With reference to the third aspect, in a first implementation manner of the third aspect, the obtaining, by the processor, MPD file information corresponding to the target multimedia segment is described. The processor acquires MPD file information corresponding to the target multimedia segment according to the MPD file information corresponding to the target multimedia segment from the terminal, wherein the MPD file information is acquired by the terminal from the server.

By executing the above operation, the access network device can directly acquire the MPD file information corresponding to the target multimedia segment from the terminal, thereby improving the processing efficiency of the access network device.

With reference to the third aspect, in a second implementation manner of the third aspect, the obtaining, by the processor, MPD file information corresponding to the target multimedia segment is described. The processor acquires MPD file information corresponding to the target multimedia segment from an MPD file response message, wherein the MPD file response message is a response of the server to an MPD file request message sent by the terminal, and the MPD file request message is used for requesting to acquire the MPD file information corresponding to the target multimedia segment.

By executing the above operation, the access network device may monitor an MPD file request message sent by the terminal to the server, and monitor an MPD file response message sent by the server to the terminal according to the MPD file request message, thereby acquiring MPD file information from the MPD file response message. The access network equipment intercepts and captures the MPD file information sent to the terminal by the server, and the terminal does not need to send the MPD file information to the access network equipment, so that the complexity and the system overhead of the terminal are reduced.

With reference to the second implementation manner of the third aspect, in a third implementation manner of the third aspect, the acquiring, by the processor, MPD file information corresponding to the target multimedia segment from the MPD file response message specifically includes: the processor acquires MPD file information corresponding to the target multimedia segment from the MPD file response message according to first indication information from the terminal, wherein the first indication information is used for indicating the access network equipment to acquire the MPD file information sent by the server.

By executing the above operation, because the MPD file response message belongs to an application layer message, according to a normal processing flow, the access network device only transparently transmits the message without analyzing specific contents therein, whereas in the present invention, the access network device needs to analyze the MPD file response message and acquire MPD file information therefrom, and the access network device can monitor the MPD file information sent to the terminal by the server according to the first indication information sent by the terminal and acquire the MPD file information from the MPD file response message, instead of analyzing all messages sent by the server, thereby reducing the system overhead of the access network device.

With reference to the third aspect, or the first implementation manner of the third aspect, or the second implementation manner of the third aspect, or the third implementation manner of the third aspect, in a fourth implementation manner of the third aspect, the processor is described to acquire the first code rate. The processor acquires a first code rate from MPD file information according to a first media identifier from the terminal. Here, the first media identifier is used to indicate a first code rate at which the terminal downloads the target multimedia segment.

With reference to the fourth implementation manner of the third aspect, in a fifth implementation manner of the third aspect, the first media identifier may be sent to the access network device through a first RRC message or a first MAC message.

With reference to the third aspect, or the first implementation manner of the third aspect, or the second implementation manner of the third aspect, or the third implementation manner of the third aspect, or the fourth implementation manner of the third aspect, or the fifth implementation manner of the third aspect, in a sixth implementation manner of the third aspect, the transceiver sends the first information to the terminal is described. And the transceiver sends a second media identifier to the terminal, wherein the second media identifier is used for indicating the terminal to acquire a second code rate from the MPD file information according to the second media identifier and download a target multimedia segment corresponding to the second code rate from the server.

With reference to the sixth implementation manner of the third aspect, in a seventh implementation manner of the third aspect, the second media identifier may be sent to the terminal through a second RRC message or a second MAC message.

With reference to the third aspect, or the first implementation manner of the third aspect, or the second implementation manner of the third aspect, or the third implementation manner of the third aspect, in an eighth implementation manner of the third aspect, the processor is described to obtain the first code rate. The processor acquires the first code rate from a multimedia segment downloading request message sent to the server by the terminal. The multimedia fragment downloading request comprises a first code rate and an identifier of a target multimedia fragment, and the multimedia fragment downloading request is used for requesting to download the target multimedia fragment corresponding to the first code rate.

By executing the operation, the access network equipment directly acquires the first code rate from the multimedia fragment downloading request message sent by the terminal by monitoring the multimedia fragment downloading request message sent by the terminal, and the operation is simple and convenient.

With reference to the third aspect, or the first implementation manner of the third aspect, or the second implementation manner of the third aspect, or the third implementation manner of the third aspect, or the eighth implementation manner of the third aspect, in a ninth implementation manner of the third aspect, the description is made on the transceiver transmitting the first information to the terminal. And the transceiver sends the target multimedia segment corresponding to the second code rate to the terminal, wherein the target multimedia segment corresponding to the second code rate is downloaded from the server by the access network equipment.

With reference to the third implementation manner of the third aspect, in a tenth implementation manner of the third aspect, the first indication information may be sent to the access network device through a third RRC message or a third MAC message.

In a fourth aspect, a terminal is provided, which includes a transceiver, wherein the transceiver is configured to perform the following operations: the transceiver sends a first message to the access network device, wherein the first message is used for the access network device to acquire MPD file information corresponding to a target multimedia segment, and the target multimedia segment is a multimedia segment requested to be downloaded by the terminal. The transceiver transmits a second message to the access network device. The second message is used for the access network equipment to acquire the first code rate and determine the second code rate according to the first code rate, the network state and the MPD file information, wherein the first code rate is a code rate adopted by the terminal to download the target multimedia segment, and the MPD file information comprises the first code rate and the second code rate. And the transceiver receives first information sent by the access network equipment, wherein the first information is used for the terminal to download the target multimedia segment corresponding to the second code rate according to the first information.

With reference to the fourth aspect, in a first implementation manner of the fourth aspect, the first message includes MPD file information corresponding to the target multimedia segment.

By executing the operation, the terminal can directly send the MPD file corresponding to the target multimedia segment to the access network equipment, so that the processing efficiency of the access network equipment is improved.

With reference to the fourth aspect, in a second implementation manner of the fourth aspect, the first message is an MPD file request message, and the MPD file request message is used to request to acquire MPD file information corresponding to a target multimedia segment.

By executing the above operation, the terminal may send an MPD file request message to the access network device, and the access network device may monitor an MPD file request message sent by the terminal to the server, and monitor an MPD file response message sent by the server to the terminal according to the MPD file request message, thereby acquiring MPD file information from the MPD file response message. The access network equipment intercepts MPD file information sent to the terminal by the server.

With reference to the second implementation manner of the fourth aspect, in a third implementation manner of the fourth aspect, before the transceiver sends the first message to the access network device, the transceiver is further configured to: and sending first indication information to the access network equipment, wherein the first indication information is used for indicating the access network equipment to acquire MPD file information sent by the server.

By executing the above operation, because the MPD file response message belongs to an application layer message, according to a normal processing flow, the access network device only transparently transmits the message without analyzing specific contents therein, whereas in the present invention, the access network device needs to analyze the MPD file response message and acquire MPD file information therefrom, the terminal may send the first indication information to the access network device, the access network device may monitor the MPD file information sent to the terminal by the server according to the first indication information and acquire the MPD file information from the MPD file response message, instead of analyzing all messages sent by the server, which reduces the system overhead of the access network device.

With reference to the fourth aspect, or the first implementation manner of the fourth aspect, or the second implementation manner of the fourth aspect, or the third implementation manner of the fourth aspect, in a fourth implementation manner of the fourth aspect, the second message includes a first media identifier, and the first media identifier is used to instruct the access network device to acquire the first bitrate from the MPD file information according to the first media identifier.

With reference to the fourth implementation manner of the fourth aspect, in a fifth implementation manner of the fourth aspect, the terminal may send the first media identifier to the access network device through a first RRC message or a first MAC message.

With reference to the fourth aspect, or the first implementation manner of the fourth aspect, or the second implementation manner of the fourth aspect, or the third implementation manner of the fourth aspect, or the fourth implementation manner of the fourth aspect, or the fifth implementation manner of the fourth aspect, in a sixth implementation manner of the fourth aspect, the transceiver receives the first information sent by the access network device, and is described. And the transceiver receives a second media identifier sent by the access network equipment, wherein the second media identifier is used for the terminal to acquire a second code rate corresponding to the second media identifier from the MPD file information and download a target multimedia segment corresponding to the second code rate from the server.

With reference to the sixth implementation manner of the fourth aspect, in a seventh implementation manner of the fourth aspect, the second media identifier may be sent to the terminal through a second RRC message or a second MAC message.

With reference to the fourth aspect, or the first implementation manner of the fourth aspect, or the second implementation manner of the fourth aspect, or the third implementation manner of the fourth aspect, in an eighth implementation manner of the fourth aspect, the second message is a multimedia clip downloading request message, the multimedia clip downloading request message includes the first bitrate and an identifier of the target multimedia clip, and the multimedia clip downloading request is used to request to download the target multimedia clip corresponding to the first bitrate.

With reference to the fourth aspect, or the first implementation manner of the fourth aspect, or the second implementation manner of the fourth aspect, or the third implementation manner of the fourth aspect, or the eighth implementation manner of the fourth aspect, in a ninth implementation manner of the fourth aspect, the transceiver receives the first information sent by the access network device, and is described. And the processor receives a target multimedia segment corresponding to a second code rate sent by the access network equipment through the transceiver, wherein the target multimedia segment corresponding to the second code rate is downloaded from the server by the access network equipment.

With reference to the third implementation manner of the fourth aspect, in a tenth implementation manner of the fourth aspect, the first indication information may be sent to the access network device through a third RRC message or a third MAC message.

In a fifth aspect, an access network device is provided, where the access network device includes a module or a unit for executing the multimedia transmission method of the first aspect.

The access network device comprises, for example, a first acquiring unit, a second acquiring unit, a determining unit and a sending unit, wherein,

the terminal comprises a first acquisition unit, a second acquisition unit and a third acquisition unit, wherein the first acquisition unit is used for acquiring MPD file information corresponding to a target multimedia segment, and the target multimedia segment is a multimedia segment requested to be downloaded by the terminal;

the second obtaining unit is used for obtaining a first code rate, wherein the first code rate is a code rate adopted by the terminal for downloading the target multimedia fragment;

the determining unit is used for determining a second code rate according to the first code rate and the network state acquired by the second acquiring unit and the MPD file information acquired by the first acquiring unit, wherein the MPD file information comprises the first code rate and the second code rate;

and the sending unit is used for sending first information to the terminal, wherein the first information is used for downloading the target multimedia segment corresponding to the second code rate determined by the determining unit according to the first information by the terminal.

The modules or elements comprised by the access network equipment are not limited to the above-mentioned nomenclature.

In a sixth aspect, a terminal is provided, which comprises means or units for performing the multimedia transmission method of the second aspect.

The terminal comprises, for example, a first transmitting unit, a second transmitting unit and a receiving unit, wherein,

the terminal comprises a first sending unit and a second sending unit, wherein the first sending unit is used for sending a first message to the access network equipment, the first message is used for the access network equipment to acquire Media Presentation Description (MPD) file information corresponding to a target multimedia segment, and the target multimedia segment is a multimedia segment requested to be downloaded by the terminal;

a second sending unit, configured to send a second message to the access network device; the second message is used for the access network equipment to acquire a first code rate and determine a second code rate according to the first code rate, the network state and the MPD file information, wherein the first code rate is a code rate adopted by the terminal to download the target multimedia segment, and the MPD file information comprises the first code rate and the second code rate;

and the receiving unit is used for receiving first information sent by the access network equipment, and the first information is used for the terminal to download the target multimedia fragment corresponding to the second code rate according to the first information.

The modules or units included in the terminal are not limited to the above-mentioned naming modes.

In a seventh aspect, a communication system is provided, which includes an access network device, a terminal and a server, where the access network device is the access network device described in the third aspect or the fifth aspect, and the terminal is the terminal described in the fourth aspect or the sixth aspect.

In an eighth aspect, a computer storage medium is provided that may be non-volatile, i.e., the content is not lost upon power down. The storage medium stores therein a software program which, when read and executed by one or more processors, may implement the multimedia transmission method provided by the first aspect or any one of the implementations of the first aspect described above.

In a ninth aspect, a computer storage medium is provided that may be non-volatile, i.e., the content is not lost upon power down. The storage medium stores therein a software program which, when read and executed by one or more processors, can implement the multimedia transmission method provided by the second aspect or any one of the implementations of the second aspect described above.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below.

FIG. 1 is an architectural diagram of a DASH system;

fig. 2 is a flow chart illustrating a multimedia transmission method according to a conventional technique;

FIG. 3 is a block diagram of a communication system to which an embodiment of the present invention is applicable;

fig. 4 is a flowchart illustrating a multimedia transmission method according to an embodiment of the present invention;

fig. 5 is a schematic flowchart of a first embodiment in which an access network device acquires MPD file information;

fig. 6 is a schematic flowchart of a second embodiment in which the access network device acquires MPD file information;

fig. 7 is a flowchart illustrating a first embodiment of downloading, by a terminal, a target multimedia segment with a second bitrate according to an embodiment of the present invention;

fig. 8 is a flowchart illustrating a second embodiment of downloading, by a terminal, a target multimedia segment with a second bitrate according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a first embodiment of an access network device according to the present invention;

fig. 10 is a flowchart of a first embodiment of a terminal according to the present invention;

fig. 11 is a schematic structural diagram of a second access network device according to an embodiment of the present invention;

fig. 12 is a flowchart illustrating a second terminal according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly described below with reference to the drawings in the embodiments of the present invention.

Fig. 3 is a schematic diagram of a communication system according to an embodiment of the present invention. As shown in fig. 3, the communication system includes a terminal, an access network device, and a server, where the communication system may specifically be a DASH system, the terminal may specifically be a DASH client, and the server may specifically be a DASH server.

The terminal and the access network device may communicate with each other through some air interface technology. The air interface technology may include: existing 2G (e.g., Global System for Mobile Communications (GSM)) systems, 3G (e.g., Universal Mobile Telecommunications System (UMTS)), WIDeband Code Division Multiple Access (WCDMA), Time Division-Synchronous Code Division Multiple Access (TD-SCDMA)), 4G (e.g., FDD LTE, TDD LTE), and 5G systems to be developed in the future.

The terminal may be a Mobile Station (MS) in a 2G network, a User Equipment (UE) in a 3G and 4G network, or a terminal in a future 5G system. Terminals include, but are not limited to: smart phones (such as Android phones, iOS phones, etc.), tablet computers, palm computers, notebook computers, Mobile Internet Devices (MID for short), wearable Devices (such as smartwatches, smartbands, etc.), and other terminal Devices with media playing capability.

The access network device may be a Base Transceiver Station (BTS) in a GSM or CDMA system, a Base station (NodeB) in a WCDMA system, an evolved node b (eNB) in a Long Term Evolution (Long Term Evolution) system, or an access network device in a future 5G system.

The server described in the embodiments of the present invention stores multimedia file (e.g., video file, audio file) information.

Fig. 4 is a schematic flow chart of a multimedia transmission method according to an embodiment of the present invention. As shown in fig. 4, the multimedia transmission method may include, but is not limited to, the following steps.

S401, the access network equipment acquires MPD file information corresponding to a target multimedia segment, wherein the target multimedia segment is a multimedia segment requested to be downloaded by a terminal.

Wherein, the target multimedia segment includes but is not limited to: a video clip or an audio clip.

The MPD file is composed of a series of time-continuous and non-overlapping media periods (english: Period), and a complete multimedia stream may be composed of one or more periods, where each Period represents a certain time Period. For example, a certain barcode stream has a time of 60 seconds, Period1 from 0-15 seconds, Period2 from 16 seconds to 40 seconds, and Period3 from 41 seconds to 60 seconds. A Period consists of one or more Adaptation sets. For example, Period1 is composed of two Adaptation Set, i.e., Adaptation Set1 and Adaptation Set2, where Adaptation Set1 represents video content and Adaptation Set2 represents audio content. Each Adaptation Set contains one or more media file Representation (i.e., replication) information. Each replication includes a plurality of media information such as code rate, resolution, bandwidth, and the like, and one or more segments (english: segments) and URLs corresponding to the segments. Each fragment can be further divided into a plurality of sub-fragments which are continuous in time and do not overlap with each other according to the time sequence. Each slice or sub-slice is an actual audio/video segment, and any one of the slices or sub-slices may be a target multimedia segment in the embodiment of the present invention. The terminal may download the fragment from the server through an HTTP request message according to the URL corresponding to the fragment.

Wherein, a plurality of repetition with the same media time interval identification (English: Period ID) and adaptive set identification (English: Adaptation set ID) are a plurality of multimedia segments with different code rates corresponding to the same multimedia file. Therefore, a group of multimedia fragments belonging to the same multimedia file can be determined according to the two identifications of the Period ID and the Adaptation Set ID. And determining a target multimedia segment according to the three identifiers of the Period ID, the Adaptation Set ID and the media file Representation identifier (English: Representation ID). And according to the Period ID, the Adaptation Set ID and the reproduction ID, media information corresponding to a target multimedia segment can be determined, wherein the media information comprises code rate, resolution and the like.

As an optional implementation manner, the manner for the access network device to acquire the MPD file information corresponding to the target multimedia segment may be: before sending a request message for downloading a target multimedia segment to a server, a terminal may send MPD file information corresponding to the target multimedia segment to an access network device, where the MPD file information is obtained by the terminal from the server and then sent to the access network device. And the access network equipment receives MPD file information sent by the terminal. Specifically, the process can be seen in the flow chart of fig. 5, which will be described in detail in the following embodiments. Optionally, the terminal sends MPD file information corresponding to the target multimedia segment to the access network device through a fourth RRC message. And the access network equipment receives a fourth RRC message which is sent by the terminal and carries the MPD file information corresponding to the target multimedia segment, and acquires the MPD file information from the fourth RRC message. Wherein the fourth RRC message may be a newly defined RRC message in the communication protocol.

As another optional implementation manner, the manner for the access network device to acquire the MPD file information corresponding to the target multimedia segment may also be: the access network equipment acquires the MPD file information corresponding to the target multimedia segment from the MPD file response message, wherein the MPD file response message is the response of the server to the MPD file request message sent by the terminal, and the MPD file request message is used for requesting to acquire the MPD file information corresponding to the target multimedia segment. Specifically, the process can be seen in the flow chart of fig. 6, which will be described in detail in the following embodiments. It should be noted that both the MPD file request message sent by the terminal and the MPD file response message sent by the server belong to HTTP layer messages, that is, application layer messages, and are transmitted by being carried on a user plane bearer. Therefore, for the access network device, the HTTP layer message is considered as user plane Data, and according to the processing mode in the prior art, the access network device only performs transparent transmission, that is, only analyzes the received Data to a Packet Data Convergence Protocol (PDCP) layer, and does not perform analysis processing on the content of an upper layer Protocol (for example, the HTTP layer). However, in the embodiment of the present invention, after receiving a data packet sent by a terminal, an access network device performs application layer parsing on the data packet, and determines whether the data packet is an MPD file request message through parsing. And after receiving the data packet sent by the server, the access network device performs application layer analysis on the data packet, and confirms whether the data packet is an MPD file response message or not through the analysis.

Further, in order to avoid that the access network device performs upper layer protocol analysis on all user plane data sent by the terminal, thereby bringing a large overhead to the access network device, the terminal may send the first indication information to the access network device before sending the MPD file request message. The first indication information is used for indicating the access network equipment to acquire MPD file information sent by the server. The access network equipment receives first indication information sent by the terminal, and performs application layer analysis on a data packet returned by the server according to the first indication information, so as to determine whether the data packet is an MPD file response message, and if so, obtains MPD file information corresponding to the target multimedia segment from the MPD file response message. Therefore, the access network equipment does not need to perform application layer analysis processing on all data sent by the server, and the system overhead of the access network equipment is reduced.

Optionally, the first indication information may be sent by the terminal to the access network device through a third RRC message or a third MAC message. Wherein the third RRC message may be a newly defined RRC message in the communication protocol. The third MAC message may be MAC layer Control information (MAC Control Element, abbreviated as MAC CE) in the prior art, or may be a MAC message newly defined in a communication protocol. For example, the terminal sends a third RRC message including the first indication information to the access network device, and the access network device receives the third RRC message including the first indication information sent by the terminal and acquires the first indication information from the third RRC message.

Or, the terminal may further carry the first indication information in a data link layer header field of the transmitted data packet when transmitting the MPD file request message to the access network device. For example, the first indication information may be carried in a header field of a PDCP header, a Radio Link Control (RLC) header, or a MAC header. After receiving the data packet sent by the terminal, the access network device analyzes the data link layer of the data packet, and once the first indication information is found, determines the MPD file information sent by the monitoring server. The access network equipment analyzes the data packet after receiving the data packet returned by the server, so as to determine whether the returned data packet is an MPD file response message, and if so, obtains MPD file information from the MPD file response message.

Specifically, the PDCP header, the RLC header, or the MAC header may set a certain bit as an indication bit of the first indication information, and once the indication bit is set to 0 or 1, it indicates that MPD file information sent by the access network device monitoring server is needed, that is, the access network device needs to obtain MPD file information corresponding to the target multimedia segment from an MPD file response message returned by the server.

Optionally, before sending the MPD file request message to the access network device, the terminal may send second indication information to the access network device, where the second indication information is used to instruct the access network device to perform application layer analysis on a data packet sent by the terminal. And the access network equipment receives the second indication information, and if a data packet sent by the terminal is received in the subsequent process, the data packet is subjected to application layer analysis according to the second indication information, so that the data packet is determined to be an MPD file request message. Therefore, the access network equipment is prevented from analyzing the upper layer protocol of all the received user plane data, and the system overhead of the access network equipment is reduced.

Optionally, the second indication information may be sent by the terminal to the access network device through a fifth RRC message or a fifth MAC message. Wherein the fifth RRC message may be a newly defined RRC message in the communication protocol. The fifth MAC message may be a MAC CE in the prior art, or may be a MAC message newly defined in the communication protocol. For example, the terminal sends a fifth RRC message including the second indication information to the access network device, and the access network device receives the fifth RRC message including the second indication information sent by the terminal and acquires the second indication information from the fifth RRC message.

S402, the access network equipment acquires a first code rate, wherein the first code rate is a code rate adopted by the terminal for downloading the target multimedia segment.

In this embodiment of the present invention, the first code rate may be obtained by the access network device by querying MPD file information corresponding to the target multimedia segment according to the first media identifier sent by the terminal. The first code rate may also be obtained by the access network device directly from the terminal, and the following two methods are respectively described in detail.

As an optional implementation manner, before sending the multimedia segment download request message to the server to download the target multimedia segment, the terminal may send the first media identifier to the access network device first, so as to request the access network device to adjust the first code rate selected by the terminal. The access network equipment receives a first media identifier sent by the terminal, and indexes MPD file information according to the first media identifier, so that a first code rate is obtained. The first media identifier includes three identifiers, namely, a Period ID, an adapatoset ID and a reproduction ID. The access network equipment can determine the first code rate corresponding to the three identifiers according to the three identifiers, namely the Period ID, the Adaptation Set ID and the replication ID, by indexing MPD file information corresponding to the target multimedia segment acquired in advance.

Optionally, the first media identifier may be sent by the terminal to the access network device through a first RRC message. The terminal may send a first RRC message to the access network device, where the first RRC message includes the first media identifier. The access network equipment receives a first RRC message sent by the terminal, and acquires a first media identifier from the first RRC message. The first RRC message may be a newly defined RRC message in the communication protocol. Alternatively, the first media identifier may also be sent by the terminal to the access network device through the first MAC message. The first MAC message may be a MAC CE in the prior art, or may be a MAC message newly defined in the communication protocol. For example, the terminal sends a MAC CE to the access network device, where the MAC CE includes the first media identifier. The access network equipment receives the MAC CE sent by the terminal and acquires the first media identification from the MAC CE.

For example, the first media identification is: the Period ID is 100s, the Adaptation ID is 1, and the retransmission ID is 1, and the access network device finds the MPD file according to the three IDs, so that the first code rate is determined to be 500 kbps.

Optionally, the terminal may also directly send the first code rate to the access network device. And the access network equipment receives the first code rate sent by the terminal. Specifically, the terminal may send a sixth RRC message or a sixth MAC message including the first code rate to the access network device. And the access network equipment receives a sixth RRC message or a sixth MAC message which is sent by the terminal and contains the first code rate, and acquires the first code rate from the sixth RRC message or the sixth MAC message. Therefore, the access network equipment can directly acquire the first code rate from the terminal without searching the MPD file, so that the system overhead of the access network equipment is saved, and the processing efficiency of the access network equipment is improved. Here, the sixth RRC message may be an RRC message newly defined in the communication protocol. The sixth MAC message may be a MAC CE in the prior art, or may be a MAC message newly defined in the communication protocol.

It should be noted that, since a complete multimedia file is divided into many small multimedia fragments and stored on the server, a complete multimedia file is composed of multiple multimedia fragments. When the terminal downloads the multimedia file from the server for playing, it needs to send a multimedia clip download request message to the server for each multimedia clip to obtain the multimedia clip. For example, the video file a is divided into two video segments, Segment1 and Segment2, and the terminal can know the download URLs corresponding to Segment1 and Segment2 respectively according to the MPD file information corresponding to the video file a acquired in advance. The terminal firstly sends a request message for downloading the Segment1 to the server according to the URL address corresponding to the Segment1, the server sends the Segment1 to the terminal for playing, then the terminal sends the request message for downloading the Segment2 to the server according to the URL address corresponding to the Segment2, and the server sends the Segment2 to the terminal for playing.

Therefore, in the embodiment of the present invention, before sending any one multimedia segment download request message to the server to download a certain multimedia segment for playing, the terminal needs to send a first media identifier to the access network device to request the access network device to adjust the first code rate selected by the terminal, and further download the multimedia segment corresponding to the code rate adjusted by the access network device. Or, before downloading a certain multimedia file, the terminal sends a first media identifier to the access network device to request the access network device to adjust the first code rate selected by the terminal, and then downloads a plurality of subsequent multimedia fragments according to the code rate adjusted by the access network device.

For example, the video file a is divided into two video segments, Segment1 and Segment2, for the former case, before downloading Segment1, the terminal needs to send a first RRC message containing a first media identifier to the access network device, where the first RRC message carries information of Segment1, the access network device learns, according to the first media identifier, that a first code rate corresponding to the terminal downloading Segment1 is 250Kbit/s, and then adjusts the 250Kbit/s, and the access network device sends the adjusted code rate of 500Kbit/s to the terminal, and the terminal downloads the Segment1 corresponding to the code rate of 500 Kbit/s. The terminal sends a first RRC message containing a first media identifier to the access network equipment again in the process of downloading the Segment1, the first RRC message carries information of the Segment2, the access network equipment learns that the first code rate corresponding to the Segment2 downloaded by the terminal is 500Kbit/s according to the first media identifier, then the 500Kbit/s is adjusted, the access network equipment sends the adjusted code rate of 800Kbit/s to the terminal, the terminal downloads the Segment2 corresponding to the code rate of 800Kbit/s, and the first media identifiers sent in the two times are different. For the second case, before downloading the Segment1, the terminal sends a first RRC message containing the first media identifier to the access network device, where the first RRC message carries the Segment1 identifier, the access network device learns, according to the first media identifier, that the first code rate corresponding to the terminal downloading Segment1 is 250Kbit/s, and then adjusts the 250Kbit/s, and the access network device sends the adjusted code rate of 500Kbit/s to the terminal, where the terminal downloading code rate is the Segment1 and the Segment2 corresponding to the 500 Kbit/s.

As another optional implementation manner, the terminal sends a multimedia segment download request message to the server through the access network device, where the multimedia segment download request message carries an identifier of a target multimedia segment requested to be downloaded by the terminal, a first code rate (or a first media identifier), and a URL corresponding to the target multimedia segment. The access network equipment receives a multimedia segment downloading request message sent to a server by a terminal, and performs application layer analysis on the multimedia segment downloading request message, so as to determine that the message is the multimedia segment downloading request message, and obtains a first code rate from the multimedia segment downloading request message, or obtains a first media identifier from the multimedia segment downloading request message, and obtains the first code rate by indexing MPD file information corresponding to a target multimedia segment. The identifier of the target multimedia segment may include two identifiers, i.e., a Period ID and an Adaptation Set ID, and the identifier of the target multimedia segment may also be a character string or other identifiers.

It should be noted that, because the multimedia segment download request message sent by the terminal to the server belongs to the HTTP message and is transmitted by being carried on the user plane bearer, for the access network device, the multimedia segment download request is considered as user plane data, and according to the processing method in the prior art, the access network device only performs transparent transmission, that is, only parses to the data link layer, and does not perform parsing on the upper layer protocol content.

Further, in order to avoid the access network device from analyzing the upper layer protocol for all the user plane data sent by the terminal, thereby bringing a large overhead to the access network device, the terminal may send the third indication information to the access network device before sending the multimedia segment download request message to the access network device. The third indication information is used for indicating the access network equipment to analyze the message sent by the terminal. The access network equipment receives the third indication information sent by the terminal, and if a data packet sent by the terminal is received in the subsequent process, the data packet is analyzed according to the third indication information, so that whether the data packet is a multimedia segment download request message or not is obtained, therefore, the access network equipment is prevented from analyzing the upper layer protocol of all the received user plane data, and the expense of the access network equipment is reduced. The third indication information may be sent by the terminal to the access network device through a seventh RRC message or a seventh MAC message. Wherein the seventh RRC message may be a newly defined RRC message in the communication protocol. The seventh MAC message may be a MAC CE in the prior art, or may be a MAC message newly defined in the communication protocol.

Or, the terminal may further carry the third indication information in a data link layer header field of the transmitted data packet when sending the multimedia segment download request message to the access network device. For example, the third indication information is carried in header fields of PDCP, RLC, and MAC, the access network device receives a data packet sent by the terminal, analyzes a data link layer of the data packet, and further analyzes an upper layer protocol of the received data packet once the third indication information is found, so as to determine whether the data packet is a multimedia segment download request message, and further obtain the first code rate through the multimedia segment download request message.

It should be noted that step S401 may be executed before step S402, may be executed after step S402, and may also be executed simultaneously with step S402, and the embodiment of the present invention is not particularly limited. For example, the terminal sends MPD file information and a first media identifier corresponding to the target multimedia segment to the access network device, and the access network device receives the MPD file information and the first code rate corresponding to the target multimedia segment.

S403, the access network equipment determines a second code rate according to the first code rate, the network state and the MPD file information, wherein the MPD file information comprises the first code rate and the second code rate.

Specifically, the access network device determines whether the first code rate needs to be adjusted according to the network state, and determines the adjusted second code rate by querying MPD file information if it is determined that the first code rate needs to be adjusted. And if the first code rate does not need to be adjusted, the second code rate is equal to the first code rate. Among them, the network status includes but is not limited to: network load and channel quality. The network load may be embodied in: the number of users connected to the access network device, the size of the traffic currently served by the access network device, the available bandwidth of the access network device, the usage of physical resource blocks (PRB for short), and the like. The channel quality may be reflected in: the quality of the link between the access network device and the terminal, etc.

Optionally, the access network device may query MPD file information corresponding to the target multimedia segment according to a first media identifier (specifically, three identifiers, i.e., a Period ID, an Adaptation Set ID, and a replication ID) sent by the terminal, search multiple replication corresponding to the two identifiers, i.e., the Period ID and the Adaptation Set ID, from the MPD file information, obtain a code rate corresponding to each replication, and use all code rates except the first code rate as the second code rate. For example, if the Period ID in the first media identifier sent by the terminal is 100s and the Adaptation set ID is 1, the access network device searches MPD file information according to the two IDs to determine two repetitions, which are respectively repetition 1 and repetition 2. Wherein, the code rate corresponding to the repetition 1 is 500kbps, the code rate corresponding to the repetition 2 is 250kbps, and the repetition ID in the first media identifier sent by the terminal is 1, then the access network device can determine that the first code rate is the code rate corresponding to the repetition 1, that is, 500kbps, and then the code rate corresponding to the other repetition 2, that is, 250kbps, can determine that it is the second code rate.

Or, the access network device queries MPD file information corresponding to the target multimedia segment according to an identifier of the target multimedia segment carried in a multimedia segment download request message sent by the terminal, searches multiple replication corresponding to the target multimedia segment from the MPD file information, obtains a code rate corresponding to each replication, and takes other code rates except the first code rate as the second code rate.

If the access network equipment determines that the first code rate needs to be increased according to the current network state, the access network equipment searches whether a code rate larger than the first code rate exists in MPD file information corresponding to the target multimedia segment, and accordingly determines a second code rate; if the access network equipment determines that the first code rate needs to be reduced according to the current network state, the access network equipment searches whether a code rate smaller than the first code rate exists in MPD file information corresponding to the target multimedia segment, and accordingly determines a second code rate.

For example, assuming that the first code rate is 500Kbit/s, the target multimedia segment has a second code rate which is 250Kbit/s, if the number of users currently accessed by the access network device is large, or the traffic of the current service is large, or the current available bandwidth is small, the network load is heavy, the access network device reduces the first code rate, and reduces the 500Kbit/s to 250Kbit/s, thereby improving the processing efficiency of the access network device and reducing the load pressure of the access network device. Or assuming that the first code rate is 250Kbit/s, the target multimedia segment has a second code rate which is 500Kbit/s, when the number of users currently accessed by the access network device is small, or the traffic of the current service is small, or the currently available bandwidth is large, the network load is light, the access network device increases the first code rate and adjusts 250Kbit/s to 500Kbit/s, thereby improving the utilization rate of the wireless resources of the access network device, enabling the terminal to receive the multimedia segment with the higher code rate, improving the quality of video (or audio) playing, and improving the experience of the user watching the video.

S404, the access network equipment sends first information to the terminal, and the first information is used for the terminal to download the target multimedia fragment corresponding to the second code rate according to the first information.

As an alternative implementation, the first information includes the second media identification. Specifically, if the terminal sends the first media identifier to the access network device before sending the multimedia segment download request message to the server to download the target multimedia segment, so as to request the access network device to adjust the first code rate selected by the terminal, the access network device may send the second media identifier corresponding to the adjusted second code rate to the terminal, where the second media identifier may be a representational id. And the terminal receives a second media identifier sent by the access network equipment, further searches MPD file information corresponding to the target multimedia segment, searches a second code rate corresponding to the second media identifier and a URL corresponding to the target multimedia segment in the MPD file information, and then downloads the corresponding target multimedia segment from the server according to the URL and the second code rate. Specifically, the process can be seen in the flow chart of fig. 7, which will be described in detail in the following embodiments.

Optionally, the access network device may send a second RRC message containing the second media identifier to the terminal. And the terminal receives a second RRC message containing a second media identifier sent by the access network equipment, and acquires the second media identifier from the second RRC message. Wherein the second RRC message may be a newly defined RRC message in the communication protocol. Alternatively, the access network device may further send a second MAC message containing a second media identifier to the terminal. And the terminal receives a second MAC message containing a second media identifier sent by the access network equipment and acquires the second media identifier from the second MAC message. The second MAC message may be a MAC CE in the prior art, or may be a MAC message newly defined in the communication protocol.

Optionally, the access network device may also directly send the second code rate to the terminal. And the terminal receives the second code rate sent by the access network equipment. Optionally, the access network device may send an eighth RRC message or an eighth MAC message containing the second code rate to the terminal. And the terminal receives the MAC message or the eighth RRC message which contains the second code rate and is sent by the access network equipment, and acquires the second code rate from the MAC message or the eighth RRC message. Wherein the eighth RRC message may be a newly defined RRC message in the communication protocol. The eighth MAC message may be a MAC CE in the prior art, or may be a MAC message newly defined in the communication protocol.

For example, the terminal wants to download Segment1, and the first code rate selected by the terminal is 500kbps, if the access network device adjusts 500kbps to 250kbps according to the current network state, and sends the media identifier retransmission 2 corresponding to 250kbps to the terminal, the terminal receives the media identifier retransmission 2 sent by the access network device. And the terminal searches MPD file information corresponding to the target multimedia Segment according to the reproduction 2, determines that the second code rate is 250kbps, and further downloads Segment1 corresponding to 250 kbps.

As another optional implementation manner, the first information includes a target multimedia segment corresponding to the second code rate. Specifically, if the terminal sends a multimedia clip download request message to the server through the access network device, the multimedia clip download request message carries an identifier of a target multimedia clip requested to be downloaded by the terminal, a first code rate used by the terminal to download the target multimedia clip, and a URL corresponding to the target multimedia clip. After the second code rate is determined, the access network device searches MPD file information corresponding to the target multimedia segment to obtain the URL of the target multimedia segment corresponding to the second code rate, and further sends another multimedia segment download request message to the server, where the multimedia segment download request message includes the URL of the target multimedia segment corresponding to the second code rate, so as to download the target multimedia segment meeting the second code rate. Optionally, the multimedia segment download request message may further include a second bitrate. And the server sends the target multimedia fragment with the second code rate to the access network equipment. And the access network equipment receives the target multimedia fragment with the second code rate sent by the server, sends the target multimedia fragment with the second code rate to the terminal, and the terminal receives the target multimedia fragment with the second code rate sent by the access network equipment. Specifically, the process can be seen in the flow chart of fig. 8, which will be described in detail in the following embodiments.

Optionally, when the access network device downloads the target multimedia segment to the URL corresponding to the second code rate, the access network device may further send indication information to the terminal to notify that the terminal has adjusted the code rate, and may further send the adjusted second code rate to the terminal.

For example, the terminal wants to download Segment1, and sends a multimedia Segment download request message for Segment1 to the server through the access network device, where the multimedia Segment download request message includes the identifier of Segment1, the first bitrate 500kbps, and the URL (such as http:// www.e.com/dash-5-1) corresponding to Segment 1. After receiving the multimedia Segment download request message, the access network equipment acquires that the first code rate selected by the terminal is 500kbps, adjusts the 500kbps to 250kbps according to the current network state, searches the URL corresponding to Segment1 of the 250kbps from the MPD file information, assumes http:// www.e.com/dash-7-1, downloads the Segment1 with the code rate of 250kbps in the http:// www.e.com/dash-7-1 address, and sends the downloaded Segment1 of the 250kbps to the terminal.

It should be noted that, the access network device may adjust, according to the MPD file information corresponding to the target multimedia segment, a code rate used for downloading the target multimedia segment, and may also adjust, according to the MPD file information, a resolution corresponding to the target multimedia segment, where the resolution adjustment mode may refer to the code rate adjustment mode, and details are not described here.

Fig. 5 is a schematic flowchart illustrating a first embodiment of obtaining MPD file information by an access network device. The process includes steps S501 to S504, wherein the detailed description of each step is as follows:

s501: and the terminal sends an MPD file request message to the server. And the server receives an MPD file request message sent by the terminal.

And the MPD file request message carries the identifier of the target multimedia segment requested to be downloaded by the terminal. Specifically, the terminal sends an MPD file request message to the access network device, and the access network device receives the MPD file request message sent by the terminal and then sends the MPD file request message to the server. In the process, the access network device only transparently transmits the MPD file request message, and does not analyze the content in the MPD file request message.

S502: and the server sends an MPD file response message to the terminal according to the MPD file request message. And the terminal receives the MPD file response message sent by the server.

And the MPD file response message comprises MPD file information corresponding to the target multimedia segment. Specifically, the server sends the MPD file response message to the access network device. And the access network equipment receives the MPD file response message sent by the server and then sends the MPD file response message to the terminal. In the process, the access network device only transparently transmits the MPD file response message, and does not analyze the content in the MPD file response message.

S503: and the terminal acquires the MPD file information corresponding to the target multimedia segment from the MPD file response message.

S504: and the terminal sends the MPD file information corresponding to the target multimedia segment to the access network equipment. And the access network equipment receives MPD file information corresponding to the target multimedia segment sent by the terminal.

Fig. 6 is a schematic flow chart of a second embodiment in which the access network device acquires MPD file information. The process includes steps S601 to S605, wherein the detailed description of each step is as follows:

s601: and the terminal sends an MPD file request message to the access network equipment. And the access network equipment receives an MPD file request message sent by the terminal.

Optionally, the MPD file request message may carry an identifier of the target multimedia segment, or carry an identifier of a multimedia file to which the target multimedia segment belongs. The access network equipment receives an MPD file request message sent to the server by the terminal, and performs application layer analysis on the received message, so as to determine that the message is the MPD file request message.

S602: and the access network equipment sends the MPD file request message sent by the terminal to the server. And the server receives an MPD file request message sent by the access network equipment.

S603: and the server sends an MPD file response message to the access network equipment. And the access network equipment receives the MPD file response message sent by the server.

Specifically, the MPD file response message includes MPD file information corresponding to the target multimedia segment. After the access network equipment sends the MPD file request message to the server, the access network equipment starts to monitor an MPD file response message returned by the server, if the access network equipment receives the MPD file response message returned by the server, application layer analysis is carried out on the received message, and therefore the message is determined to be the MPD file response message, and MPD file information corresponding to the target multimedia segment is obtained from the MPD file response message.

S604: and the access network equipment acquires the MPD file information corresponding to the target multimedia segment from the MPD file response message.

S605: and the access network equipment sends an MPD file response message to the terminal. And the terminal receives an MPD file response message sent by the access network equipment.

Therefore, the access network device analyzes the MPD file response message sent by the server in the subsequent process when determining that the message sent by the terminal is the MPD file request message, instead of analyzing all data sent by the server, so that the system overhead of the access network device is reduced.

Please refer to fig. 7, which is a flowchart illustrating a first embodiment of downloading a target multimedia clip with a second bitrate by a terminal according to an embodiment of the present invention. The process includes steps S701 to S706, and the detailed description of each step is as follows:

s701: and the terminal sends the first media identification to the access network equipment. The access network equipment receives a first media identification sent by the terminal.

The first media identification is used for the access network equipment to determine the first code rate.

S702: the access network equipment queries MPD file information corresponding to the target multimedia segment according to the first media identifier, obtains a first code rate, and determines a second code rate according to the first code rate, the network state and the MPD file information.

S703: and the access network equipment sends the second media identification to the terminal. And the terminal receives the second media identification sent by the access network equipment.

And the second media identification is used for the terminal to determine a second code rate.

S704: and the terminal queries MPD file information corresponding to the target multimedia segment according to the second media identifier, and acquires a second code rate and a URL corresponding to the target multimedia segment.

S705: the terminal sends a multimedia clip download request message to the server. The server receives a multimedia segment downloading request message sent by the terminal.

And the multimedia fragment downloading request message comprises the second code rate, the identification of the target multimedia fragment and the URL. And the server determines the target multimedia fragment corresponding to the second code rate according to the URL. Specifically, the terminal sends the multimedia segment download request message to the access network device, the access network device receives the multimedia segment download request message sent by the terminal and sends the multimedia segment download request message to the server, and in the process, the access network device only transparently transmits the multimedia segment download request message and does not analyze the content in the multimedia segment download request message.

S706: and the server sends the target multimedia segment with the second code rate to the terminal. And the terminal receives the target multimedia segment with the second code rate sent by the server.

Specifically, the server sends the target multimedia segment with the second code rate to the access network device, and the access network device receives the target multimedia segment with the second code rate sent by the server and sends the target multimedia segment with the second code rate to the terminal.

By executing the steps, before the terminal downloads the target multimedia segment, the access network equipment can adjust the first code rate selected by the terminal, and then the terminal downloads the target multimedia segment corresponding to the adjusted code rate, so that the selected code rate is appropriate, and better user experience can be ensured.

Please refer to fig. 8, which is a flowchart illustrating a second embodiment of downloading a target multimedia clip with a second bitrate by a terminal according to an embodiment of the present invention. The process includes steps S801 to S805, and the detailed description of each step is as follows:

s801: the terminal sends a first multimedia segment downloading request message to the access network equipment. The access network equipment receives a first multimedia segment downloading request message sent by the terminal.

The first multimedia clip downloading request message carries an identifier of a target multimedia clip requested to be downloaded by the terminal, a first code rate adopted by the terminal to download the target multimedia clip and a URL corresponding to the target multimedia clip.

S802: and the access network equipment acquires the first code rate from the first multimedia segment downloading request message and determines the second code rate according to the first code rate, the network state and the MPD file information.

S803: and the access network equipment sends a second multimedia segment downloading request message to the server. And the server receives a second multimedia segment downloading request message sent by the access network equipment.

And the second multimedia fragment downloading request message carries the identifier of the target multimedia fragment, the second code rate and the URL.

S804: and the server sends the target multimedia fragment with the second code rate to the access network equipment. And the access network equipment receives the target multimedia fragment with the second code rate sent by the server.

S805: and the access network equipment sends the target multimedia segment with the second code rate to the terminal. And the terminal receives the target multimedia fragment with the second code rate sent by the access network equipment.

By executing the steps, the terminal can adjust the first code rate selected by the terminal by the access network device in the process of downloading the target multimedia segment, then download the target multimedia segment according to the adjusted code rate, and further send the target multimedia segment corresponding to the adjusted code rate to the terminal, so that the selected code rate can be ensured to be appropriate, and better user experience can be ensured.

In order to better implement the multimedia transmission method of the embodiment of the invention, the invention also provides related equipment for implementing the implementation method.

Fig. 9 is a schematic structural diagram of an access network device according to a first embodiment of the present invention. As shown in fig. 9, the access network device 90 includes at least one processor 901 and a transceiver 902. The processor 901 and the transceiver 902 may be connected by a bus or other means.

The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (enhanced Industry Standard Architecture) bus, an Integrated Circuit (IIC) bus, or the like.

Processor 901 may be a general-purpose processor, such as a Central Processing Unit (CPU), and processor 901 may further include a hardware chip, which may be a combination of one or more of the following: an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), and a Complex Programmable Logic Device (CPLD). The processor 901 may process data received via the transceiver 902. Processor 901 may also process data to be sent to transceiver 902 for transmission over the antenna. The processor 901 is configured to perform radio channel management, and perform control for handover of a terminal device in the control area. In a specific implementation, the processor 901 may include: the module used for speech channel exchange and information exchange, the module used for finishing call processing, signaling processing, wireless resource management, management of wireless link and circuit maintenance function and the module used for finishing multiplexing and demultiplexing and code conversion function. The specific information can refer to mobile communication related knowledge.

The transceiver 902 is used for performing transmission processing, such as modulation, on the mobile communication signal generated by the processor 901, and is also used for performing reception processing, such as demodulation, on the mobile communication signal received by the antenna.

If the processor 901 is a CPU or a combination comprising a CPU, the access network device 90 further comprises a memory 903 for storing and transmitting program code to the CPU. In this embodiment of the present invention, the memory 903 is used for storing multimedia transmission program codes and MPD file information described in the above embodiments. The Memory 903 may include a Volatile Memory (e.g., a Random Access Memory (RAM)); the Memory 903 may also include a Non-volatile Memory (ROM), such as a Read-Only Memory (Read-Only Memory), a flash Memory (flash Memory), a hard disk (hard disk Drive, HDD) or a Solid-State Drive (SSD); the memory 903 may also comprise a combination of memories of the kind described above. The memory 903 is connected to the processor 901 via a bus.

Optionally, the access network device 90 may further include a network interface 904 and a power module 905.

Network interface 904 comprises an interface for access network device 90 to communicate data with terminals, such as MSs in 2G, UEs in 3G and 4G, and terminals in future 5G networks, etc. In a specific implementation, the network interface 904 may include: one or more of a GSM (2G) wireless network interface, a WCDMA (3G) wireless network interface, an LTE (4G) wireless network interface and the like, and can also be a future 5G wireless network interface. The network interface 904 also includes an interface for the access network device 90 to communicate data with a server. In a specific implementation, the network interface 904 may include: an ethernet interface.

The power module 905 is used to supply power to each module of the access network device 90.

In this embodiment of the present invention, the processor 901 and the transceiver 902 are configured to perform the following operations:

the processor 901 obtains MPD file information corresponding to a target multimedia segment, where the target multimedia segment is a multimedia segment requested to be downloaded by a terminal;

the processor 901 obtains a first code rate, where the first code rate is a code rate used by the terminal to download the target multimedia segment;

the processor 901 determines a second code rate according to the first code rate, the network state and MPD file information, where the MPD file information includes the first code rate and the second code rate;

the transceiver 902 sends first information to the terminal, where the first information is used for the terminal to download a target multimedia segment corresponding to the second code rate according to the first information.

Optionally, the processor 901 obtains MPD file information corresponding to the target multimedia segment, including:

the processor 901 obtains MPD file information corresponding to a target multimedia segment from a terminal according to MPD file information corresponding to the target multimedia segment, where the MPD file information corresponding to the target multimedia segment is obtained by the terminal from a server.

the processor 901 obtains MPD file information corresponding to a target multimedia segment from an MPD file response message, where the MPD file response message is a response of a server to an MPD file request message sent by a terminal, and the MPD file request message is used to request to obtain the MPD file information corresponding to the target multimedia segment.

Optionally, the processor 901 obtains MPD file information corresponding to the target multimedia segment from the MPD file response message, where the MPD file information includes:

the processor 901 obtains MPD file information corresponding to the target multimedia segment from the MPD file response message according to the first indication information from the terminal.

Optionally, the first indication information may be sent to the access network device 90 through a third RRC message.

Optionally, the first indication information may be sent to the access network device 90 through a third MAC message.

Optionally, the processor 901 obtains the first code rate, including:

the processor 901 obtains a first code rate from the MPD file information according to the first media identifier from the terminal.

Optionally, the first media identifier may be sent to the access network device through a first RRC message.

Optionally, the first media identifier may be sent to the access network device through a first MAC message.

Optionally, the transceiver 902 sends the first information to the terminal, including:

the transceiver 902 sends a second media identifier to the terminal, where the second media identifier is used to instruct the terminal to obtain a second code rate from the MPD file information according to the second media identifier, and download a target multimedia segment corresponding to the second code rate from the server.

Optionally, the second media identifier may be sent to the terminal through a second RRC message.

Optionally, the second media identifier may be sent to the terminal through a second MAC message.

Optionally, the obtaining, by the processor 901, the first code rate includes:

the processor 901 obtains a first code rate from a multimedia segment download request message sent by the terminal to the server; the multimedia fragment downloading request comprises a first code rate and an identifier of a target multimedia fragment, and the multimedia fragment downloading request is used for requesting to download the target multimedia fragment corresponding to the first code rate.

the transceiver 902 sends the target multimedia segment corresponding to the second code rate to the terminal, where the target multimedia segment corresponding to the second code rate is downloaded from the server by the access network device.

It should be noted that, for the functions of each functional module in the access network device 90 described in the embodiment of the present invention, reference may be made to related descriptions of the corresponding access network device in the embodiments shown in fig. 4, or fig. 5, or fig. 6, or fig. 7, or fig. 8, and no further description is given here.

Fig. 10 is a schematic structural diagram of a terminal according to a first embodiment of the present invention. The terminal 100 shown in fig. 10 includes: the terminal 100 may further include a memory 1003, an input device 1004, an output device 1005, a sensor 1006, an audio circuit 1007, a Wireless Fidelity (WiFi) module 1008, and a power supply 1009. Those skilled in the art will appreciate that the terminal structure shown in fig. 10 is not intended to be limiting and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components. Wherein:

the transceiver 1002 may be used for transceiving information or receiving and transmitting signals during a call, and in particular, receive downlink information of an access network device and then send the received downlink information to the one or more processors 1001; in addition, data relating to the uplink is transmitted to the access network device. Generally, transceiver 1002 includes, but is not limited to, an antenna, at least one Amplifier, a tuner, one or more oscillators, a Subscriber Identity Module (SIM) card, a transceiver, a coupler, a Low Noise Amplifier (LNA), a duplexer, and the like. The transceiver 1002 can also communicate with a network and other terminal devices through wireless communication. The wireless communication may use any communication standard or protocol, including but not limited to GSM, General Packet Radio Service (GPRS), CDMA, WCDMA, LTE, email, Short Message Service (SMS), etc.

The memory 1003 may be used to store programs and modules of multimedia transmission program, and the processor 1001 executes various functional applications and data processing by operating the computer programs and modules stored in the memory 1003. The memory 1003 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, and the like), and the like; the storage data area may store data created according to the use of the terminal 100, such as a photographed photo, audio data, video data, etc., and the like. Further, the memory 1003 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device. Accordingly, the memory 1003 may also include a memory controller to provide access to the memory 1003 by the processor 1001 and the input device 1004.

The input device 1004 may be used to receive input numeric or character information and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control. In particular, the input devices 1004 may include a touch-sensitive surface 10041 as well as other input devices 10042. The touch-sensitive surface 10041, also referred to as a touch display panel or a touch pad, may collect touch operations by a user (such as operations by a user on or near the touch-sensitive surface 10041 using a finger, a stylus, or any other suitable object or attachment) on or near the touch-sensitive surface 10041) and drive the corresponding connection device according to a predetermined program. Alternatively, the touch-sensitive surface 10041 may comprise two portions, a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor 1001, and can receive and execute commands sent by the processor 1001. In addition, the touch-sensitive surface 10041 can be implemented in a variety of types, including resistive, capacitive, infrared, and surface acoustic wave. The input device 1004 may include other input devices 10042 in addition to the touch-sensitive surface 10041. In particular, other input devices 10042 can include, but are not limited to, one or more of a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and the like.

The output device 1005 may be used to display information input by or provided to the user as well as various graphical user interfaces of the terminal 100, which may be made up of graphics, text, icons, video, and any combination thereof. The output device 1005 may include a Display panel 10051, and optionally, the Display panel 10051 may be configured in the form of a Liquid Crystal Display (LCD), an Organic Light-emitting diode (OLED), or the like. Further, the touch-sensitive surface 10041 can overlay the display panel 10041 and, when a touch operation is detected on or near the touch-sensitive surface 10041, communicate to the processor 1001 to determine the type of touch event, and the processor 1001 then provides a corresponding visual output on the display panel 10051 in accordance with the type of touch event. Although in fig. 10, the touch-sensitive surface 10041 and the display panel 10051 are implemented as two separate components for input and output functions, in some embodiments, the touch-sensitive surface 10041 and the display panel 10051 can be integrated for input and output functions.

The terminal 100 can also include at least one sensor 1006, such as a light sensor, motion sensor, and other sensors. Specifically, the light sensor may include an ambient light sensor that may adjust the brightness of the display panel 10051 according to the brightness of ambient light, and a proximity sensor that may turn off the display panel 10051 and/or a backlight, etc., when the terminal 100 is moved to the ear. As one of the motion sensors, the gravity acceleration sensor may detect the magnitude of acceleration in each direction (generally, three axes), detect the magnitude and direction of gravity when stationary, and may be used for applications (such as horizontal and vertical screen switching, related games, magnetometer attitude calibration) for recognizing the attitude of the terminal 100, and related functions (such as pedometer and tapping) for vibration recognition; as for other sensors such as a gyroscope, a barometer, a hygrometer, a thermometer, and an infrared sensor, which may be further configured in the terminal 100, detailed descriptions thereof are omitted.

The audio circuit 1007, speaker 10071, microphone 10072 can provide an audio interface between the user and the terminal 100. The audio circuit 1007 can transmit the electrical signal converted from the received audio data to the speaker 10071, and the electrical signal is converted into a sound signal by the speaker 10071 and output; on the other hand, the microphone 10072 converts a collected sound signal into an electric signal, converts the electric signal into audio data after being received by the audio circuit 1007, and outputs the audio data to the processor 1001 for processing, and then transmits the audio data to, for example, another terminal via the transceiver 1002 or outputs the audio data to the memory 1003 for further processing. The audio circuit 1007 may also include an earbud jack to provide communication of peripheral headphones with the terminal 100.

WiFi belongs to a short-distance wireless transmission technology, and the terminal 100 can help a user send and receive e-mails, browse web pages, access streaming media, and the like through the WiFi module 1008, and provides the user with wireless broadband internet access. Although fig. 10 shows the WiFi module 1008, it is understood that it does not belong to the essential constitution of the terminal 100, and may be omitted entirely as needed within the scope not changing the essence of the invention.

The processor 1001 is a control center of the terminal 100, connects various parts of the entire terminal 100 using various interfaces and lines, and performs various functions of the terminal 100 and processes data by operating or executing computer programs and/or modules stored in the memory 1003 and calling data stored in the memory 1003, thereby performing overall monitoring of the terminal 100. Optionally, processor 1001 may include one or more processing cores; preferably, the processor 1001 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 1001.

The terminal 100 also includes a power supply 1009 (e.g., a battery) for providing power to the various components, which may preferably be logically coupled to the processor 1001 via a power management system, such that functions such as managing charging, discharging, and power consumption are performed via the power management system. The power supply 1009 may also include any component or components of a dc or ac power source, recharging system, power failure detection circuitry, power converter or inverter, power status indicator, and the like.

Although not shown, the terminal 100 may further include a camera, a bluetooth module, etc., which will not be described herein. Specifically, in the embodiment of the present invention, the output device 1005 (or the input device 1004) of the terminal is a touch screen display, the terminal 100 further includes a memory 1003, a processor 1001, and one or more computer programs, wherein the one or more computer programs are stored in the memory 1003, and the processor 1001 is configured to invoke a management program of multimedia files stored in the memory 1003 (a non-volatile memory) to execute the following steps.

In this embodiment of the present invention, the transceiver 1002 is configured to perform the following operations:

the transceiver 1002 sends a first message, where the first message is used for an access network device to acquire MPD file information corresponding to a target multimedia segment, where the target multimedia segment is a multimedia segment requested to be downloaded by a terminal;

the transceiver 1002 sends a second message to the access network device; the second message is used for the access network equipment to acquire a first code rate and determine a second code rate according to the first code rate, the network state and the MPD file information, wherein the first code rate is a code rate adopted by the terminal to download the target multimedia segment, and the MPD file information comprises the first code rate and the second code rate;

the transceiver 1002 receives first information sent by the access network device, where the first information is used for the terminal 100 to download a target multimedia segment corresponding to the second code rate according to the first information.

Optionally, the first message includes MPD file information corresponding to the target multimedia segment.

Optionally, the first message is an MPD file request message, where the MPD file request message is used to request to acquire MPD file information corresponding to the target multimedia segment.

By executing the above operation, the terminal may send an MPD file request message to the access network device, and the access network device may monitor an MPD file request message sent by the terminal to the server, and monitor an MPD file response message sent by the server to the terminal according to the MPD file request message, thereby acquiring MPD file information from the MPD file response message. The access network equipment intercepts and captures the MPD file information sent to the terminal by the server, and the terminal does not need to send the MPD file information to the access network equipment, so that the complexity and the system overhead of the terminal are reduced.

Optionally, before the transceiver 1002 sends the first message to the access network device, the transceiver 1002 is further configured to:

and sending first indication information to the access network equipment, wherein the first indication information is used for indicating the access network equipment to acquire MPD file information sent by the server.

Optionally, the first indication information may be sent to the access network device through a third RRC message.

Optionally, the first indication information may be sent to the access network device through a third MAC message.

Optionally, the second message includes a first media identifier, where the first media identifier is used to instruct the access network device to obtain the first bitrate from the MPD file information according to the first media identifier.

Optionally, the transceiver 1002 receives first information sent by the access network device, where the first information includes:

the transceiver 1002 receives a second media identifier sent by the access network device, where the second media identifier is used for the terminal to obtain a second code rate corresponding to the second media identifier from the MPD file information, and download a target multimedia segment corresponding to the second code rate from the server.

Optionally, the second message is a multimedia fragment downloading request message sent by the terminal to the server, the multimedia fragment downloading request message includes a first code rate and an identifier of the target multimedia fragment, and the multimedia fragment downloading request is used to request to download the target multimedia fragment corresponding to the first code rate.

By executing the operation, the terminal sends a multimedia segment downloading request message to the access network equipment, and the access network equipment directly obtains the first code rate from the multimedia segment downloading request message sent by the terminal by monitoring the multimedia segment downloading request message, so that the operation is simple and convenient.

the transceiver 1002 receives a target multimedia segment corresponding to a second code rate sent by the access network device, where the target multimedia segment corresponding to the second code rate is downloaded from the server by the access network device.

It should be noted that, for the functions of each functional module in the terminal 100 described in the embodiment of the present invention, reference may be made to the related description of the corresponding terminal in the embodiment shown in fig. 4, or fig. 5, or fig. 6, or fig. 7, or fig. 8, which is not described herein again.

Fig. 11 is a schematic structural diagram of an access network device according to a second embodiment of the present invention. As shown in fig. 11, the access network device 110 includes: a first acquisition unit 1101, a second acquisition unit 1102, a determination unit 1103, and a sending unit 1104, wherein,

a first obtaining unit 1101, configured to obtain MPD file information corresponding to a target multimedia segment, where the target multimedia segment is a multimedia segment requested to be downloaded by a terminal;

a second obtaining unit 1102, configured to obtain a first code rate, where the first code rate is a code rate used by the terminal to download the target multimedia segment;

a determining unit 1103, configured to determine a second code rate according to the first code rate and the network state acquired by the second acquiring unit 1102 and MPD file information acquired by the first acquiring unit 1101, where the MPD file information includes the first code rate and the second code rate;

a sending unit 1104, configured to send, to the terminal, first information, where the first information is used for the terminal to download, according to the first information, the target multimedia segment corresponding to the second code rate determined by the determining unit 1103.

In this embodiment, the access network device 110 is presented in the form of a functional unit. An "element" may refer to an Application Specific Integrated Circuit (ASIC), a processor and memory that execute one or more software or firmware programs, an Integrated logic Circuit, and/or other devices that may provide functionality.

By the operation unit, the access network equipment adjusts the code rate adopted by the terminal for downloading the target multimedia fragment according to the network state, so that the terminal downloads the target multimedia fragment corresponding to the adjusted second code rate, the selected code rate can be ensured to be appropriate, and better user experience can be ensured.

Optionally, the first obtaining unit 1101 is specifically configured to:

and acquiring MPD file information corresponding to the target multimedia segment according to the MPD file information corresponding to the target multimedia segment from the terminal, wherein the MPD file information is acquired by the terminal from the server.

By operating the above units, the access network device can directly acquire the MPD file information corresponding to the target multimedia segment from the terminal, thereby improving the processing efficiency of the access network device.

Optionally, the first obtaining unit 1101 is specifically configured to:

and acquiring MPD file information corresponding to the target multimedia segment from the MPD file response message, wherein the MPD file response message is a response of the server to an MPD file request message sent by the terminal, and the MPD file request message is used for requesting to acquire the MPD file information corresponding to the target multimedia segment.

By operating the above units, the access network device may monitor an MPD file request message sent by the terminal to the server, and monitor an MPD file response message sent by the server to the terminal according to the MPD file request message, thereby acquiring MPD file information from the MPD file response message. The access network equipment intercepts and captures the MPD file information sent to the terminal by the server, and the terminal does not need to send the MPD file information to the access network equipment, so that the complexity and the system overhead of the terminal are reduced.

Optionally, the first obtaining unit 1101 is specifically configured to:

and acquiring MPD file information corresponding to the target multimedia segment from the MPD file response message according to the first indication information from the terminal, wherein the first indication information is used for indicating the access network equipment to acquire the MPD file information sent by the server.

By operating the above units, because the MPD file response message belongs to an application layer message, according to a normal processing flow, the access network device only transparently transmits the message without analyzing specific contents therein, whereas in the present invention, the access network device needs to analyze the MPD file response message and acquire MPD file information therefrom, and the access network device can monitor the MPD file information sent to the terminal by the server according to the first indication information sent by the terminal and acquire the MPD file information from the MPD file response message, instead of analyzing all messages sent by the server, thereby reducing the system overhead of the access network device.

Optionally, the second obtaining unit 1102 is specifically configured to:

and acquiring a first code rate from MPD file information according to a first media identifier from the terminal.

Optionally, the sending unit 1104 is specifically configured to:

and sending a second media identifier to the terminal, where the second media identifier is used to instruct the terminal to acquire the second code rate determined by the determining unit 1103 from the MPD file information according to the second media identifier, and downloading the target multimedia segment corresponding to the second code rate from the server.

Optionally, the second obtaining unit 1102 is specifically configured to:

acquiring a first code rate from a multimedia fragment downloading request message sent to a server by a terminal; the multimedia segment downloading request message comprises a first code rate and an identifier of a target multimedia segment, and the multimedia segment downloading request is used for requesting to download the target multimedia segment corresponding to the first code rate.

By operating the above units, the access network device directly obtains the first code rate from the multimedia clip download request message sent by the terminal by monitoring the multimedia clip download request message sent by the terminal, which is simple and convenient.

Optionally, the sending unit 1104 is specifically configured to:

the target multimedia segment corresponding to the second code rate determined by the determining unit 1103 is sent to the terminal, where the target multimedia segment corresponding to the second code rate is downloaded from the server by the access network device.

It should be noted that, for the functions of each functional unit in the access network device 110 described in the embodiment of the present invention, reference may be made to related descriptions of the corresponding access network device in the embodiments shown in fig. 4, or fig. 5, or fig. 6, or fig. 7, or fig. 8, and no further description is given here.

Fig. 12 is a schematic structural diagram of a second terminal according to an embodiment of the present invention. As shown in fig. 12, the terminal 120 includes: a first transmission unit 1201, a second transmission unit 1202, and a reception unit 1203, wherein,

a first sending unit 1201, configured to send a first message to an access network device, where the first message is used for the access network device to obtain Media Presentation Description (MPD) file information corresponding to a target multimedia segment, and the target multimedia segment is a multimedia segment requested to be downloaded by a terminal;

a second sending unit 1202, configured to send a second message to the access network device; the second message is used for the access network equipment to acquire a first code rate and determine a second code rate according to the first code rate, the network state and the MPD file information, wherein the first code rate is a code rate adopted by the terminal to download the target multimedia segment, and the MPD file information comprises the first code rate and the second code rate;

a receiving unit 1203 is configured to receive first information sent by the access network device, where the first information is used by the terminal 120 to download, according to the first information, a target multimedia segment corresponding to the second code rate.

In the present embodiment, the terminal 120 is presented in the form of a functional unit. As used herein, a "unit" may refer to an ASIC, a processor and memory that execute one or more software or firmware programs, an integrated logic circuit, and/or other device that may provide functionality.

By operating the above units, the access network device adjusts the code rate used by the terminal to download the target multimedia segment according to the network state, so that the terminal downloads the target multimedia segment corresponding to the adjusted second code rate, the selected code rate can be ensured to be appropriate, and better user experience can be ensured.

Optionally, the terminal 120 further includes:

a third sending unit, configured to send, before the first sending unit 1201 sends the first message to the access network device, first indication information to the access network device, where the first indication information is used to indicate the access network device to acquire MPD file information sent by the server.

By operating the above units, because the MPD file response message belongs to an application layer message, according to a normal processing flow, the access network device only transparently transmits the message without analyzing specific contents thereof, whereas in the present invention, the access network device needs to analyze the MPD file response message and acquire MPD file information therefrom, the terminal can send first indication information to the access network device, the access network device can monitor the MPD file information sent to the terminal by the server according to the first indication information and acquire the MPD file information from the MPD file response message, instead of analyzing all messages sent by the server, so that the system overhead of the access network device is reduced.

Optionally, the receiving unit 1203 is specifically configured to:

and receiving a second media identifier sent by the access network device, where the second media identifier is used by the terminal 120 to obtain a second code rate corresponding to the second media identifier from the MPD file information, and downloading a target multimedia segment corresponding to the second code rate from the server.

Optionally, the receiving unit 1203 is specifically configured to:

and receiving a target multimedia segment corresponding to a second code rate sent by the access network equipment, wherein the target multimedia segment corresponding to the second code rate is downloaded from the server by the access network equipment.

It should be noted that, for the functions of each functional unit in the terminal 120 described in the embodiment of the present invention, reference may be made to related descriptions of the corresponding terminal in the embodiments shown in fig. 4, or fig. 5, or fig. 6, or fig. 7, or fig. 8, which are not described herein again.

Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.

While the invention has been described in connection with various embodiments, it will be understood that it is not intended to limit the scope of the invention, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims. The terms "first," "second," "third," and the like in the description and in the claims and in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. In the claims, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. A single controller or other unit may fulfill the functions of several items recited in the claims. Certain terms are recited in mutually different dependent claims, but this does not indicate that a combination of these terms cannot be used to advantage. A computer program may be stored/distributed on a suitable medium, such as: optical storage media or solid-state media, provided in or as part of other hardware, may also be distributed in other ways, such as via the Internet (english: Internet) or other wired or wireless systems.

Claims

1. A method for multimedia transmission, comprising:

the access network equipment acquires MPD file information corresponding to a target multimedia segment from an MPD file response message, wherein the MPD file response message is a response of a server to an MPD file request message sent by a terminal, the MPD file request message is used for requesting to acquire the MPD file information corresponding to the target multimedia segment, and the target multimedia segment is a multimedia segment requested to be downloaded by the terminal;

the access network equipment acquires a first code rate, wherein the first code rate is a code rate adopted by the terminal for downloading the target multimedia fragment;

the access network equipment determines a second code rate according to the first code rate, the network state and the MPD file information, wherein the MPD file information comprises the first code rate and the second code rate;

and the access network equipment sends first information to the terminal, wherein the first information is used for indicating the terminal to send a multimedia fragment downloading request message to the server so as to download the target multimedia fragment corresponding to the second code rate from the server.

2. The method of claim 1, wherein the obtaining, by the access network device, MPD file information corresponding to the target multimedia segment from an MPD file response message comprises:

and the access network equipment acquires MPD file information corresponding to the target multimedia segment from the MPD file response message according to first indication information from the terminal, wherein the first indication information is used for indicating the access network equipment to acquire the MPD file information sent by the server.

3. The method of claim 1 or 2, wherein the obtaining, by the access network device, the first code rate comprises:

and the access network equipment acquires the first code rate from the MPD file information according to the first media identifier from the terminal.

4. The method according to claim 1 or 2, wherein the access network device sends the first information to the terminal, and the method comprises:

and the access network equipment sends a second media identifier to the terminal, wherein the second media identifier is used for indicating the terminal to acquire the second code rate from the MPD file information according to the second media identifier and downloading the target multimedia segment corresponding to the second code rate from a server.

5. A method for multimedia transmission, comprising:

a terminal sends a first message to a server, wherein the first message is an MPD file request message, the MPD file request message is used for requesting to acquire MPD file information corresponding to a target multimedia segment, and the target multimedia segment is a multimedia segment requested to be downloaded by the terminal; the access network equipment acquires the MPD file information from a response message which is sent by the server to the terminal and aims at the MPD file request message;

the terminal sends a second message to the access network equipment; the second message is used for the access network device to obtain a first code rate and determine a second code rate according to the first code rate, the network state and the MPD file information, wherein the first code rate is a code rate adopted by the terminal to download the target multimedia segment, and the MPD file information includes the first code rate and the second code rate;

and the terminal receives first information sent by the access network equipment, wherein the first information is used for indicating the terminal to send a multimedia fragment downloading request message to the server so as to download the target multimedia fragment corresponding to the second code rate from the server.

6. The method of claim 5, wherein before the terminal sends the first message to the server, the method further comprises:

the terminal sends first indication information to the access network device, where the first indication information is used to indicate the access network device to acquire the MPD file information sent by the server.

7. The method of claim 5 or 6, wherein the second message includes a first media identifier, and wherein the first media identifier is used to instruct the access network device to obtain the first bitrate from the MPD file information according to the first media identifier.

8. The method according to claim 5 or 6, wherein the second message is a multimedia clip download request message sent by the terminal to a server, the multimedia clip download request message includes the first bitrate and an identifier of the target multimedia clip, and the multimedia clip download request is used to request to download the target multimedia clip corresponding to the first bitrate.

9. The method according to claim 5 or 6, wherein the first information includes a second media identifier, and the receiving, by the terminal, the first information sent by the access network device includes:

and the terminal receives a second media identifier sent by the access network device, where the second media identifier is used for the terminal to acquire the second code rate corresponding to the second media identifier from the MPD file information, and download the target multimedia segment corresponding to the second code rate from a server.

10. An access network device, comprising:

the system comprises a first obtaining unit, a second obtaining unit and a third obtaining unit, wherein the first obtaining unit is used for obtaining MPD file information corresponding to a target multimedia segment from an MPD file response message, the MPD file response message is a response of a server to an MPD file request message sent by a terminal, the MPD file request message is used for requesting to obtain the MPD file information corresponding to the target multimedia segment, and the target multimedia segment is a multimedia segment requested to be downloaded by the terminal;

a second obtaining unit, configured to obtain a first code rate, where the first code rate is a code rate used by the terminal to download the target multimedia segment;

a determining unit, configured to determine a second code rate according to the first code rate and the network state acquired by the second acquiring unit and the MPD file information acquired by the first acquiring unit, where the MPD file information includes the first code rate and the second code rate;

a sending unit, configured to send first information to the terminal, where the first information is used to instruct the terminal to send a multimedia clip downloading request message to the server, so as to download the target multimedia clip corresponding to the second code rate from the server.

11. The access network device of claim 10, wherein the first obtaining unit is specifically configured to:

and acquiring MPD file information corresponding to the target multimedia segment from the MPD file response message according to first indication information from the terminal, wherein the first indication information is used for indicating the access network equipment to acquire the MPD file information sent by the server.

12. The access network device according to claim 10 or 11, wherein the second obtaining unit is specifically configured to:

and acquiring the first code rate from the MPD file information according to the first media identifier from the terminal.

13. The access network device according to any one of claims 10 or 11, wherein the first information includes a second media identifier, and the sending unit is specifically configured to:

and sending a second media identifier to the terminal, where the second media identifier is used to instruct the terminal to acquire the second bitrate determined by the determining unit from the MPD file information according to the second media identifier, and downloading the target multimedia segment corresponding to the second bitrate from a server.

14. A terminal, comprising:

a first sending unit, configured to send a first message to a server, where the first message is an MPD file request message, the MPD file request message is used to request to acquire MPD file information corresponding to a target multimedia segment, and the target multimedia segment is a multimedia segment requested to be downloaded by the terminal, where an access network device acquires the MPD file information from a response message, which is sent by the server to the terminal and is for the MPD file request message;

a second sending unit, configured to send a second message to the access network device; the second message is used for the access network device to obtain a first code rate and determine a second code rate according to the first code rate, the network state and the MPD file information, wherein the first code rate is a code rate adopted by the terminal to download the target multimedia segment, and the MPD file information includes the first code rate and the second code rate;

a receiving unit, configured to receive first information sent by the access network device, where the first information is used to instruct the terminal to send a multimedia segment download request message to the server, so as to download the target multimedia segment corresponding to the second code rate from the server.

15. The terminal of claim 14, further comprising:

a third sending unit, configured to send first indication information to the access network device before the first sending unit sends the first message to a server, where the first indication information is used to indicate the access network device to acquire the MPD file information sent by the server.

16. The terminal of claim 14 or 15, wherein the second message includes a first media identifier, and wherein the first media identifier is used to instruct the access network device to obtain the first bitrate from the MPD file information according to the first media identifier.

17. The terminal according to claim 14 or 15, wherein the second message is a multimedia clip download request message sent by the terminal to a server, the multimedia clip download request message includes the first bitrate and an identifier of the target multimedia clip, and the multimedia clip download request is used to request to download the target multimedia clip corresponding to the first bitrate.

18. The terminal according to claim 14 or 15, wherein the first information includes a second media identifier, and the receiving unit is specifically configured to:

and receiving a second media identifier sent by the access network device, where the second media identifier is used by the terminal to obtain the second code rate corresponding to the second media identifier from the MPD file information, and downloading the target multimedia segment corresponding to the second code rate from a server.